title: The association of genetic markers for type 2 diabetes with prediabetic status - cross-sectional data of a diabetes prevention trial.
abstract: OBJECTIVE
  To investigate the association of risk alleles for type 2 diabetes with prediabetes accounting for age, anthropometry, inflammatory markers and lifestyle habits.
  
  
  METHODS
  Cross-sectional study of 129 men and 157 women of medium-sized companies in northern Germany in the Delay of Impaired Glucose Tolerance by a Healthy Lifestyle Trial (DELIGHT).
  
  
  METHODS
  Besides established risk factors, 41 single nucleotide polymorphisms (SNPs) that have previously been found to be associated with type 2 diabetes were analyzed. As a nonparametric test a random forest approach was used that allows processing of a large number of predictors. Variables with the highest impact were entered into a multivariate logistic regression model to estimate their association with prediabetes.
  
  
  RESULTS
  Individuals with prediabetes were characterized by a slightly, but significantly higher number of type 2 diabetes risk alleles (42.5±4.1 vs. 41.3±4.1, p = 0.013). After adjustment for age and waist circumference 6 SNPs with the highest impact in the random forest analysis were associated with risk for prediabetes in a logistic regression model. At least 5 of these SNPs were positively related to prediabetic status (odds ratio for prediabetes 1.57 per allele (Cl 1.21-2.10, p = 0.001)).
  
  
  CONCLUSIONS
  This explorative analysis of data of DELIGHT demonstrates that at least 6 out of 41 genetic variants characteristic of individuals with type 2 diabetes may also be associated with prediabetes. Accumulation of these risk alleles may markedly increase the risk for prediabetes. However, prospective studies are required to corroborate these findings and to demonstrate the predictive value of these genetic variants for the risk to develop prediabetes.
authors.affiliation: University Medical Center Hamburg-Eppendorf, Endocrinology and Metabolism of Ageing, Hamburg, Germany.
authors.forename: Birgit-Christiane
authors.initials: BC
authors.lastname: Zyriax
authors.forename: Ramona
authors.initials: R
authors.lastname: Salazar
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Hoeppner
authors.forename: Eik
authors.initials: E
authors.lastname: Vettorazzi
authors.forename: Christian
authors.initials: C
authors.lastname: Herder
authors.forename: Eberhard
authors.initials: E
authors.lastname: Windler
mesh_terms: D000367:Age Factors; D000483:Alleles; D000886:Anthropometry; D003430:Cross-Sectional Studies; D003924:Diabetes Mellitus, Type 2 / Q000453:epidemiology* / Q000235:genetics* / Q000517:prevention & control*; D005260:Female; D005819:Genetic Markers / Q000235:genetics*; D005858:Germany / Q000453:epidemiology; D006801:Humans; D008019:Life Style; D016015:Logistic Models; D008297:Male; D016017:Odds Ratio; D020641:Polymorphism, Single Nucleotide / Q000235:genetics; D011236:Prediabetic State / Q000235:genetics*; D012307:Risk Factors; D055105:Waist Circumference
chemical_list: D005819:Genetic Markers